Punch



M. B. BLAOKMER.

(No Model.)

PUNGH.

Patented Oct. 19, 1886.

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PATENT MALTIAH B. BLAGKMER, OF PLYMOUTH, MASSACHUSETTS.

PUNCH.

C'PECIFIGATION forming part of Letters Patent No 350,968, dated October 19,1886.

Application filed December 5, 1885. Serial No. 184,837. (No model.)

To all whom it may concern.-

Be itknown that I, DIALTIAH B. BLACKMER, of Plymouth, in the county of Plymouth and State of Massachusetts, have invented certain new and useful Improvements in Punches, of which the following is a specification.

This invention has for its object to provide an improved means forholding a small punch or punches used to perforate steel shanks for boot and shoe soles.

The invention consists in a punch composed of a rod of indefinite length combined with two jaws, which are caused to clamp said rod by set-screws or other pressure devices inserted in a holder that contains said jaws and rod, as I will now proceed to describe.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a vertical section of a punch and its holding devices embodying my invention. Fig. 2represents a section on line :0 00, Fig. 1. Figs. 3 and -lrepresent modifications.

In the drawings, (1 represents the punch, which is a cylindrical rod or wire of any desired length.

b I) represent the two jaws, each of which is preferably made in a separate piece, preferably semicircular in cross-section. Said jaws have grooves in their fiat inner sides, which partially receive the rod or punch (gas shown in Fig. 2.

0 represents the holder, which is suitably affixed to a cross-head or plunger in an organized punching-machine, and has a socket formed to receive the j awsb b,and one or more set-screws or other pressure devices, whereby the jaws may be clamped against the rod or punch and secured to the holder.

It will be seen that by loosening the set screws the punch may be raised or lowered,

either with the jaws or independently thereof,

the punch being loosened or released by the jaws when the screws are loosened; hence the punch can be adjusted downwardly as fast as it is worn at its operating end,and securely held at any point to which it is adjusted. The jaws may also be adjusted to and held at any desired height by the same means,so that after the punch is so reduced in length that it cannot be further adjusted independently to com pensate for wear, the jaws may be adjusted downwardly until the portion of the punch projecting from them is worn out.

The jaws may be provided with two grooves, so to hold two punches.

The jaws may be rectangular in cross-section instead of semi-cylindrical.

My invention is not limited to punches for perforating steel shanks, but may be used for general punching wherever a small hole is to be made in metal by a reciprocating punch.

A modification is shown in Figs. 3 and at, in which only one movable clamping jaw or part is used,the other clamping part being one side of the socket in the holder (3. Both clampingsurl'aces are grooved, as in the examples previously described.

I claim A punch consisting of a rod, a, of uniform diameter, formed to act as a punch at any portion of its length, two jaws having grooved faces embracing the rod, a holder for said jaws,anda set screw or screws which hold the jaws and rod and permit said rod to be adjusted to compensate for wear thereof, as set forth.

In testimony whereofI have signed my name to this specification,in the presence oftwo subscribing witnesses, this 12th day of November, 1885.

MALTIAH B. BLAOKMER.

Vitn esses:

i. F. BEowN, A. D. HARRISON. 

